Some uses of the PHP trim () function

String Trim ( string $str [, string $charlist ])- removes white space characters (or other characters) from the beginning and end of a string

Trim () function when the second argument is empty, the default is to remove spaces, tabs, newline characters, carriage returns, vertical tabs, and so on, when the second argument is added

1) Trim (' \ ' string\ ', ' \ ' sg '); Final output: \ "Strin

2) Trim (' \ ' string\ ', ' \ ' sg '); Final output: \ "String\"

2) Trim (' \ ' string\ ', ' \ ' sg '); Final output: Trin

　　So the trim () function takes precedence over whitespace characters from the first and the end of the character, and then filters out the given character to be removed (list), and also applies to the LTrim (), RTrim () function

Some uses of the PHP trim () function